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тАО03-17-2010 09:03 AM
тАО03-17-2010 09:03 AM
V8.3-1H1 Installed with Gigabit nics and slow net performance
I have them plugged into cisco switches. The switch ports are auto-auto gigabit.
Copying file from a 1.0Gb machine to my integrity server and only get approx 5Mb/s transfer.
Should I be setting the OS to use Jumbo frames and also have the switch ports reconfigured.?
I have seen some performance tips on the net but cant find anything on HP.com about setting this on the OS.
Note: This is a standalone box.
Thanks for any assistance.
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тАО03-17-2010 09:42 AM
тАО03-17-2010 09:42 AM
Re: V8.3-1H1 Installed with Gigabit nics and slow net performance
trying to judge NIC speed by copying files around involves too many other possible bottlenecks.
If you have another system running OpenVMS and DECnet, run a DTSEND test.
Or copy a file to the null device on OpenVMS, this eliminates possible issues with writing the file to disk:
FTP your-vms-system
...
FTP> PUT localfile NLA0:
Volker.
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тАО03-17-2010 09:48 AM
тАО03-17-2010 09:48 AM
Re: V8.3-1H1 Installed with Gigabit nics and slow net performance
As a start, I would look the error counters on the switch ports, and both hosts involved in the transfer. Any significant number of collisions or retransmissions is a red flag.
Consider setting the switch appropriately and using WireShark to capture the entire conversation, then look at what is actually causing the delay.
- Bob Gezelter, http://www.rlgsc.com
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тАО03-17-2010 10:05 AM
тАО03-17-2010 10:05 AM
Re: V8.3-1H1 Installed with Gigabit nics and slow net performance
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тАО03-17-2010 10:21 AM
тАО03-17-2010 10:21 AM
Re: V8.3-1H1 Installed with Gigabit nics and slow net performance
You say copy a file, but you don't mention how you're doing the copy. Windows protocols and SMB take a large overhead on data verification. With FTP, there's the stepping down the network stack and packaging things up for the network card to do before it ever gets to the wire.
Have you looked at LANCP at what the ports have actually configured themselves as? It could be that negotiation is the culprit here and the Cisco switch and the Integrity have negotiated a much slower speed than you are expecting. There may also be contention on the wire.
Steve
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тАО03-17-2010 12:43 PM
тАО03-17-2010 12:43 PM
Re: V8.3-1H1 Installed with Gigabit nics and slow net performance
What is on the other side?
Out-of-the-box OpenVMS is NOT set up for speedy FTP's.
What makes you think is is a network issue?
Was it any faster on 100mb?
How are the disks and CPU doing during the transfer. They should hardly move.
Did you calibrate with
- a local FTP over loopback?
- NL: device output
- disk-to-disk copy.
- reverse direction copy.. from VMS to PC.
Did you measure disk activity?
Disable High-Water-Marking on the output disk? (SET VOLUM/NOHIGH)
Checked SHOW RMS? for buffer/blocks/extent?
Check with Google for prior topics in thsi space. For example:
http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1341603
Hope this helps,
Hein van den Heuvel
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тАО03-17-2010 01:32 PM
тАО03-17-2010 01:32 PM
Re: V8.3-1H1 Installed with Gigabit nics and slow net performance
I remember a case where a customer wasn't getting expected network throughput copying files after upgrading from 10MB to 100MB.
The throughput was more than 10MB, but only just. After spending quite some time checking all network components in the path between the nodes, it turned out the bottleneck was the write performance of the destination disk drive!
Try to eliminate as many factors as possible when testing.
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тАО03-17-2010 03:43 PM
тАО03-17-2010 03:43 PM
Re: V8.3-1H1 Installed with Gigabit nics and slow net performance
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тАО03-17-2010 04:54 PM
тАО03-17-2010 04:54 PM
Re: V8.3-1H1 Installed with Gigabit nics and slow net performance
Before going too far down this investigation, please verify what RMS buffering parameters are in use on both sides.
In particular, you are interested in the /BLOCK, /BUFFER, and /EXTEND settings. Of the three, /EXTEND is the often the most time consuming.
Remember, an extend of 100 blocks will not last very long at 1Gb.
- Bob Gezelter, http://www.rlgsc.com
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тАО03-17-2010 06:11 PM
тАО03-17-2010 06:11 PM
Re: V8.3-1H1 Installed with Gigabit nics and slow net performance
Is the copy operation you used to verify the speed believed to be representative of the actual usage of the link? Will the link's dominant usage be similar to the copy used to test it?
If it is, then let's figure out an expectation and figure out whether it lives up to that, and perhaps why it does not perform as expected.
Your expectation is probably 100 MB/sec.
Well, can you source that?
Can you sink it?
But if it isn't, then let's try to characterize the real load, and somehow measure that. Maybe latency is more relevant than throughput? Or packets/sec?
You may want to find, or write, a little tool to volley some request/response packets back and forward with selectable concurrency and measure its performance.
I'm sure stuff like that is out there, and I know that when I wrote one for a special test (mimic SAP messages) it was immensely more valuable than the 'quick' ftp test we relied on before.
Knowing how say FTP or NFS behaved helped, but the real McCoy is the application itself or something that closely mimics it (similatr packet sizes, rates, active port counts, active ip addresses, it may all matter.
Cheers,
Hein van den Heuvel